Snakes
Order Squamata, Suborder Serpentes

Venomous

All of North America's venomous snakes,
except coral snakes, are pit vipers (family Crotalidae).
North American pit vipers have a deep, heat-sensitive loreal "pit" located
between the eyes and nostrils of the snake (seen clearly on the copperhead),
and front hinged fangs with a mostly hemotoxic venom which affects the muscle
tissue and circulatory system. Coral snakes belong to the family Elapidae,
front fixed fangs with a mostly neurotoxic venom which affects the central
nervous system. Other elapids include the cobras and mambas.